I just found out, that he has a web site www.gtautoparts.com .  And he says, you can ask for lowering some parts' price and you can email him directly.  Even now, on Sunday, he answered back withing a few minutes.  
I am only giving this out to help those who would like his service, because he also sells parts for other European a Japanese cars too.  I only deal with the Vanagons, I must say.
Good luck to all,
Zoltan